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We report experimental studies of the effect of interstitial gas onmass-density-segregation in a vertically-vibrated mixture of equal-sized bronzeand glass spheres. Sufficiently strong vibration in the presence ofinterstitial gas induces vertical segregation into sharply separated bronze andglass layers. We find that the segregated steady state (i.e., bronze or glasslayer on top) is a sensitive function of gas pressure and viscosity, as well asvibration frequency and amplitude. In particular, we identify distinct regimesof behavior that characterize the change from bronze-on-top to glass-on-topsteady-state.Comment: 4 pages, 5 figures, submitted to PRL; accepted in PRE as rapid  communication, with revised text and reference

Interstitial gas and density segregation of vertically vibrated granular media